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A pipe can fill a tank in 3 hours. There...

A pipe can fill a tank in 3 hours. There are two outlet pipes from the tank which can empty it in 7 and 10 hours respectively. If all the three pipes are opened simultaneously, then the tank will be filled in `8\ hou r s` b. `9\ hou r s` c. `10\ hou r s` d. `11\ hou r s`

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